https://www.sciencedirect.com/science/article/pii/S2211124714009012 https://www.sciencedirect.com/science/article/pii/S221112471... L-tryptophan > Indole > Rai

https://www.sciencedirect.com/science/article/pii/S2211124714009012 https://www.sciencedirect.com/science/article/pii/S221112471... L-tryptophan > Indole > Raises GLP-1